Simultaneous determination of cation exchange capacity and surface area of acid activated bentonite powders by methylene blue sorption
APPLIED SURFACE SCIENCE, cilt.258, sa.7, ss.2534-2539, 2012 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 258 Sayı: 7
- Basım Tarihi: 2012
- Doi Numarası: 10.1016/j.apsusc.2011.10.088
- Dergi Adı: APPLIED SURFACE SCIENCE
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Sayfa Sayıları: ss.2534-2539
- Anahtar Kelimeler: Methylene blue, Bentonite, Smectite, Acid activation, Cation exchange capacity, Surface area, PHYSICOCHEMICAL PROPERTIES, ADSORPTION, POROSITY, REMOVAL, CLAYS, DYE
- Ankara Üniversitesi Adresli: Evet
Özet
To distinguish the ion exchanged and physically adsorbed methylene blue cations (MB+) on ionic surfaces, acid activated bentonite samples were used as porous adsorbents. A natural calcium bentonite (CaB) sample from Enez/Edirne, Turkey, was acid activated at 90 degrees C for 16 h with various HCl/CaB ratios. The irreversible exchange and physical adsorption of MB+ cations on the ionic solids have simultaneously occurred. The ion exchanged (m(ex)) and physically adsorbed (m(ad)) MB+ contents were obtained as the values of sorption capacity at c = 0 and the increase to a plateaus of adsorption isotherms, respectively. The m(ad) value was taken to be monolayer adsorption capacity. Cation exchange capacity (CEC) and specific surface area (S-MB) for each sample were calculated from the mex and m(ad) values, respectively. Also, the BET specific surface areas (S-BET) and pore size distribution were determined from low temperature nitrogen adsorption/desorption data. A linear correlation between the SMB and SBET values was found. (C) 2011 Elsevier B.V. All rights reserved.